Finding Feedback That Helps
After submission and before the viva, feedback is still one of the most useful things you can go looking for as part of your prep.
Make a list of who could really give you useful feedback: your supervisor, your office-mate, a person you met at a conference…
Make a list of topics: the way you answer questions, how clear your thesis is, whether your assumptions about your examiners are useful…
Make a list of questions: is this useful? how could this be better? why does this work well?…
Then go ask.
Go get the support you need.